Roush vs 427FE vs Keith Craft

[AL427SBF]

Originally Posted by Jerry Clayton

There is no such thing as VARIBLE MASS----a fiqure skater does not change mass as they pull in there arms/leg----------

yeah, that's my point - skater's mass remains unchanged but the rotational mass changes dramatically, read it again.

patrickt's comment illustrates exactly what we're talking about ...

I had my FE specifically built to be, in my uneducated words, "a quick revver." The builder went with a slightly shorter stroke, and all light weight stuff ...

patrickt's engine builder reduced the rotating mass of his engine by incorporating those mods.

[patrickt]

Originally Posted by AL427SBF

...The builder went with a slightly shorter stroke,

We had the "does a shorter stroke make a revvier engine" debate a few years ago. We had four very smart, very experienced FE builders chime in. Two said it absolutely did, two said it absolutely didn't.

[CobraEd]

A fatter figure skater will rev faster than a thinner figure skater unless they are wearing a blue outfit with ruffles or if there is a full moon out.


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[AL427SBF]

Originally Posted by CobraEd

A fatter figure skater will rev faster than a thinner figure skater unless they are wearing a blue outfit with ruffles or if there is a full moon out.


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lol, one last crack at it and then let them believe what they want to.

Less rotating mass = less inertia to move it (in this case spin it up or slow it down). Your engine's rotating mass is a parasitic drag on the motor, stored energy does nothing for you in terms of car acceleration*, the less rotating mass the less parasitic drain on the motor.

*unless you can rev it up and dump the clutch like in a 1/4 mile launch.

[CobraEd]

Originally Posted by AL427SBF

lol, one last crack at it and then let them believe what they want to.

Less rotating mass = less inertia to move it (in this case spin it up or slow it down). Your engine's rotating mass is a parasitic drag on the motor, stored energy does nothing for you in terms of car acceleration*, the less rotating mass the less parasitic drain on the motor.

*unless you can rev it up and dump the clutch like in a 1/4 mile launch.

Very eloquently stated, however your talking points are loaded with logic and empirically proven concepts. Unfortunately, given what we have read earlier, none of that applies here.

If I could add one additional new point just to add some flavor to this discussion, not only does the heavier big block crank add more parasitic rotational drag on the motor, but the heavier big block rods and pistons add more parasitic drag on the motor due to greater reciprocating mass. Let the games begin !!!!



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[blykins]

Heavier than what? Lighter than what?

What examples are you all pulling from? Is there a small block that you have in mind when you're discussing this, or is there a big block that you have in mind?

What parts are they using?

Do you not understand that in a lot of cases, the reciprocating mass of a big block is not heavier than the reciprocating mass of a small block?

Do you not understand that your "parasitic rotational drag" is a bogus point considering that the main journal diameter of an FE is the same diameter as the main journal in a Dart Windsor block?

Instead of speaking from emotional viewpoints, how about you guys ante up with some examples. Quoting from the Olympics and your physics book does nothing to justify your point.

The word "generalization" fits this thread very well.

Generalization: a statement about a group of people or things that is based on only a few people or things in that group.

On the 2nd page of this thread, Madmaxx said that, "as far as FE and stroked small block, the small block will rev much quicker...."

That in itself is a blanket statement, and unless you qualify each and every variable in both engines, it's incorrect.

If Jerry is going to post some balance sheets of both some big blocks and small blocks, you will find that yes, there are some small block rotating assemblies that are lighter, and yes, there are some big block rotating assemblies that are lighter.